NIDA for Teens: The Science Behind Drug Abuse for teachers
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Nerve Cells and Neurotransmission

The brain is made up of billions of nerve cells, also known as neurons. Typically, a neuron contains three important parts (Figure 4): a central cell body that directs all activities of the neuron; dendrites, short fibers that receive messages from other neurons and relay them to the cell body; and an axon, a long single fiber that transmits messages from the cell body to the dendrites of other neurons or to body tissues, such as muscles.